Hey Osirian, about the replacement for Soundboard to share files on the local network, here is my solution:
[APP][Pro] FTP Client - Apps - Homey Community Forum
I have created an FTP Client, which connects to the FTP Server from Micro Web Server App (local on Homey) and also with FTP’s on the LAN of Homey.
This works great, and i created the Ftp Client so you can easily edit the files on the Homey.
Also a flowcard to retrieve the Url and play it on or send it to devices like Sonos.
(A webservices is created to retrieve the file.)
It’s in testing now!